Trilobites, cephalopods, and brachiopods of the Stony Mountain formation, Manitoba

Abstract

A detailed study of the trilobite, brachiopod, and cephalopod part of the Stony Mountain fauna indicates a definite Richmond and in part younger age assignment. Forty-seven species belonging to 25 genera are identified, including five new species. Basic components of the fauna include cheirurid trilobites; orthocerid and ascocerid cephalopods; and orthid, rhynchonellid, and strophomenid brachiopods. The relatively small size of the trilobites and cephalopods is noted, and geographic affinities of major components discussed. Correlations with Baffin Island, Greenland, Churchill River, God's River, Bighorn Mountains, Colorado, Anticosti Island, Iowa and its associated Richmond sections are evaluated. The Stony Mountain fauna is considered to have affinities to those of sub-Arctic, eastern and upper Mississippi valley sections.